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Pre-mRNA splicing by the human spliceosome requires the sequential recognition by RNA and protein factors of the 5′ and 3′ splice sites,the branch region and the polypyrimidine tract. This sequence is characterized by the stepwise association of the U1, U2, and U4/U5/U6 snRNP particles [PMID:9476892]. Human p14 (SF3b14), a component of the spliceosomal U2 snRNP, interacts directly with the pre-mRNA branch adenosine within the context of the bulged duplex formed between the pre-mRNA branch region and U2 snRNA. This association occurs early in spliceosome assembly and persists within the fully assembled spliceosome [PMID:21062891].